Outlook Ost File Too Large?

– Reducing the size of the Offline Folder file (.ost) file may improve performance if you have deleted a large quantity of items. This procedure does not delete any items that are saved on the server.

Delete any items that you do not want to keep, and then empty the Deleted Items folder. On the Tools menu, click Account Settings, In the list, select Microsoft Exchange Server, and then click Change, Click More Settings, Click the Advanced tab, and then click Offline Folder File Settings, Click Compact Now,

Note: You do not have to exit Outlook after you compact a,ost file. Top of Page
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How do I increase Outlook OST file size limit?

This article applies only to Outlook for Windows. By default, starting from the Outlook 2010 version desktop application is able to open,pst files and create,ost which size is not more than 50 GB. If you try to open the,pst file which is more than 50 GB in size, you will receive the following error: In order to increase the maximum size of the,pst and,ost files that your Outlook can open or create you will need to add or modify the following registry entries:

• The MaxLargeFileSize registry entry (default value is 51,200 MB (50 GB))
• The WarnLargeFileSize registry entry (default value is 48,640 MB (47.5 GB))

The MaxLargeFileSize determines the absolute maximum size that both the,pst and the,ost files can grow to. After this maximum size is reached, Outlook does not permit the size of the file to grow beyond this size. The WarnLargeFileSize determines the maximum data that both the,pst and the,ost files can have.

• After this maximum data is reached, neither the,pst nor the,ost files are permitted to add any more data.
• However, the size of the physical file may still increase because of internal processes.
• Important: it is recommended that the values between the MaxLargeFileSize registry entry and the WarnLargeFileSize registry entry be at least 5 percent (%) so that internal processes are not hindered from continuing.

These settings apply to both,ost and,pst files. If you modify these registry values, this can affect,ost files that are used with Cached Exchange Mode, with AutoArchive, and with,pst. files. If Outlook is configured to download shared folders, the contents of shared folders are stored in the local Offline Outlook Data (.ost) file.

1. Click Start, and then click Run, type Regedit, and then click OK.
2. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\PST (x.0 corresponds to the Outlook version: 16.0 = Outlook 2016, 15.0 = Outlook 2013, 14.0 = Outlook 2010)
3. Click PST, and then right-click MaxLargeFileSize in the right pane.
4. Click Modify, select Decimal and then type the limit (102400 for 100 GB) in the Value data
5. Click OK,
6. Right-click WarnLargeFileSize, and repeat steps 4 through 5 (if you set the value for MaxLargeSize to 100GB then set WarnLargeFileSize to 97280 – 95 GB).

Note: you may have to create the registry values if they do not exist. If the registry values do not exist, follow these steps to create them:

1. Click Start, click Run, type Regedit, and then click OK.
2. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook (x.0 corresponds to the Outlook version: 16.0 = Outlook 2016, 15.0 = Outlook 2013, 14.0 = Outlook 2010)
3. Right-click Outlook, point to New, and then click Key,
4. Type PST, and then press ENTER.
5. Right-click PST, point to New and then click DWORD
6. Type MaxLargeFileSize, and then press ENTER
7. In the Edit DWORD Value window, choose Decimal and type the limit in the Value data box, and then click OK,
8. Repeat steps 5 through 7 to create another DWORD WarnLargeFileSize, and then close the registry.

Value for registry entries should be set in either bytes or megabytes and you will need to calculate it first. You can use any online converter to calculate the value, for example this one – enter the gygabyte value, click Convert – the value you will need is the one in binary.

• Despite the fact that you will be able to open,pst files that are larger than 50GB after making specified registry changes, it can still significantly decrease the performance of your Outlook application.
• We don’t recommend increasing it to more than 100GB due to the nature of our shared environment.

In old Outlook data file types, the entries MaxFileSize and WarnFileSize were in use. Values under MaxFileSize and WarnFileSize have been used for the old-type ANSI format (an earlier Microsoft Outlook format) data files. T he ANSI values are set in byte increments.

1. Please note that since Outlook 2003 version the datafiles are in new UNICODE formats as ANSI format supports 2 GB data file maximum.
2. The MaxFileSize registry entry (default value is 2,075,149,312 bytes (1.933 GB)) The WarnFileSize registry entry (default value is 1,950,368,768 bytes (1.816 GB)) If the old-type ANSI data file is in use please consider importing this,pst in the new profile.

The old type data file has “Outlook Data File (97-2002)” in the format of the file. If the value of the MaxFileSize registry entry ever exceeds the ANSI 2 gigabyte (GB) limit on either the,pst or the,ost files, the value will be ignored to limit the size to 2 GB to prevent corruption.
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Does archiving emails reduce OST size?

Summary:- “The increasing size of Microsoft Outlook is obvious because of its extensive use in various organizations for emailing purposes. Even when a user erased or deleted these email items the size of OST files does not reduce so much. Even the archiving method does not help.
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Can OST file be larger than 50gb?

Introduction – By default, Personal Folders (.pst) and offline Outlook Data File (.ost) files are in Unicode format in Microsoft Outlook 2010 and Outlook 2013. The overall size of,pst and,ost files has a preconfigured limit of 50 GB. This limit is larger than the limit for Unicode,pst and,ost files in Outlook 2007 and Outlook 2003.
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What happens if I delete the OST file?

How to Delete Outlook OST File? – Several users have the query is it safe to delete Outlook OST file? The answer is Yes. You can delete OST file. There will be no data loss when users remove OST file as it can be again downloaded from Exchange Server. Along with it, professionals also recommend to take backup of offline storage file into PST format.

• Close MS Outlook application.
• Go to start menu and open run window, search for OST file in the Run command. Enter the command in Run window – C:Users\UserName\AppData\Local\MicrosoftOutlook, as shown in the picture below –

• Click OK and OST file location will open.
• Select OST file and click Delete, After that, you will get a message of confirmation “Are you sure you want to move this file to recycle bin?” Click Yes and the file gets deleted.

Once OST file is deleted and users need to recreate file to get Outlook to work smoothly. This can be done by creating a new OST file with a different pathname and synchronize it with the Exchange. After that, configure Outlook account and start working with new OST file. Follow the given steps to do this with the given instructions.
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What happens when you compact an OST file?

Compacting Outlook data files reclaims the space that is unavailable because it was previously occupied by an item. This can greatly reduce the amount of space that the OST or PST file occupies on your hard drive, and helps Outlook function efficiently.
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How do I free up space in Outlook without deleting emails?

Best practices to keep your mailbox lean – If your email is stored on an email server such as Exchange, when your mailbox reaches its upper limit your administrator might start limiting functionality. For example, at 90 MB you might get a warning, at 100 MB you might be unable to send email, and at 110 MB you might be unable to receive email.

• Archive older items – Move old items you want to keep to an archive. You can create a separate Outlook Data File (.pst) that you can open from Outlook any time you need it. By default, Outlook automatically archives items at a regular interval, You can also archive items manually whenever you want. That way, you can decide which items to archive, when to archive them, and where to store them. Note: If you don’t see the Archive command, your organization may have turned off the feature.
• Empty the Deleted Items folder – Empty the Deleted Items folder frequently to make sure you aren’t keeping messages you don’t need.
• Empty the Junk Email folder – Periodically empty the Junk Email folder to save your inbox space for messages you actually want.
• Store attachments outside your mailbox – As attachments accumulate over time, they can take up a lot of space. For attachments you want to keep, consider saving them to a team site, to OneDrive, or to folders on your computer.

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Can we repair OST file?

Repair an Outlook data file (.pst) file –

1. Exit Outlook and browse to one of the following file locations:
   • Outlook 2019: C:\Program Files (x86)\Microsoft Office\root\Office16
   • Outlook 2016: C:\Program Files (x86)\Microsoft Office\root\Office16
   • Outlook 2013: C:\Program Files (x86)\Microsoft Office\Office15
   • Outlook 2010: C:\Program Files (x86)\Microsoft Office\Office14
   • Outlook 2007: C:\Program Files (x86)\Microsoft Office\Office12
2. Open SCANPST.EXE,
3. Select Browse to select the Outlook Data File (.pst) you want to scan. If you need help locating your Outlook Data File, see Locating the Outlook Data Files. Note: By default, a new log file is created during the scan. You can choose Options and opt not to have a log created, or you can have the results appended to an existing log file.
4. Choose Start to begin the scan.
5. If the scan finds errors, choose Repair to start the process to fix them. Note: The scan creates a backup file during the repair process. To change the default name or location of this backup file, in the Enter name of backup file box, enter a new name, or choose Browse to select the file you want to use. You may need to run the tool several times in order to repair your Outlook Data File. In some cases, items may not be recovered if they were permanently deleted or corrupted beyond repair.
6. When the repair is complete, start Outlook with the profile associated with the Outlook Data File you just repaired.

What happens after you repair an Outlook Data File? In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder. Although the repair process might recreate some of the folders, they may be empty.

The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can’t place in their original structure. Create new data file You can create a new Outlook Data File and drag the items in the Lost and Found folder into the new data file. After you’ve moved all the items, you can remove the Recovered Personal Folders (.pst) file, including the Lost and Found folder.

To create a new Outlook Data File, see Create an Outlook Data File, Recover items from the backup (.bak) file If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a,bak extension, and saves it in the same folder.

1. Browse to the folder where the,pst file is stored and you’ll find the,bak file (for example, [email protected]) created by the Inbox Repair tool.
2. Make a copy of the,bak file and rename it with a bak.pst extension. For example, [email protected]
3. Import the bak.pst file into Outlook, and use the Import and Export Wizard to import any additional recovered items into the newly created,pst file.

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What causes corrupt OST files?

Reasons for Frequent OST File Corruption – There can be several reasons behind OST file corruption. One possibility is that Outlook was not properly closed, leading to data corruption. Another possibility is that the file was damaged during a software or hardware update.

Sudden power failure, when the OST file is open, can lead to corruption.Malware or virus infection can also corrupt an OST file.Improper shutdown of the computer, when the OST file is open, can also cause corruption.Hardware issues like bad sectors in the hard drive can also cause corruption.OST file can also get corrupted if it is not compatible with the Outlook version.

Below we have discussed these and a few more reasons that can lead to OST corruption, categorized into hardware and software-specific issues.
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What happens when OST reaches 50gb?

Summary: OST file has reached the maximum size is an error message that appears when the size of OST reaches its configured file size or threshold limit. In this guide, we have shared a few fixes and solutions that can help you resolve the OST file size issue in Windows Outlook. OST or Offline Storage Table is a replica of the user mailbox on the Exchange Server. The file is stored on the system locally and syncs the changes made to Outlook with the user mailbox on the server. When the size of OST increases and reaches its threshold or file size limit configured on the system, the error OST file has reached the maximum size may appear.
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What do I do when my Outlook data file is full?

Archive Old Data and Keep Outlook PST File Compact – If you get this issue very first time and your PST file is still not corrupted, then you can use the inbuilt Archive feature. This option lets you move old emails in a separate,pst file. This data file can be viewed at any time when needed.

In Outlook 2007

The Microsoft Outlook 2007 PST file has 20 GB of file size limit. This size is sufficient for the home user. But, for Organizations, this file size is not suitable and they frequently face ‘Outlook data file has reached the maximum size’ error. So, if the PST file is not corrupted due to oversized, then quickly use the below instruction.

1. Go to File tab and choose Archive option from the list.
2. After that, select the radio button corresponding to Archive this folder and all subfolders, Also, mention a date in the box of Archive items older than,

Outlook Data File Archive option

Click on Browse to specify a location for the resultant archive file. Then, click on the OK button.

In Outlook 2010 / 2013 / 2016

Use the following instructions in later versions of Outlook 2007 to archive the data items.

1. Open the Microsoft Outlook on Windows platform.
2. Once it is opened, click on File >> Cleanup Tools >> Archive.
3. After that, select the Archive this folder and all subfolders option.
4. Next, you need to select the folders that you wish to archive.
5. Manually specify a date under the Archive items older than heading.
6. Click on Browse to provide a new file location and click on OK,

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Why is OST file so big?

Why are OST files so Large? OST files save mailbox data of the account from its date of creation to the last synchronization with the server and, this is why OST files are too large. Also, there are various maintenance techniques to reduce OST file sizes.
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Is it safe to delete Outlook OST file?

How to Delete Outlook OST File? – Several users have the query is it safe to delete Outlook OST file? The answer is Yes. You can delete OST file. There will be no data loss when users remove OST file as it can be again downloaded from Exchange Server. Along with it, professionals also recommend to take backup of offline storage file into PST format.

• Close MS Outlook application.
• Go to start menu and open run window, search for OST file in the Run command. Enter the command in Run window – C:Users\UserName\AppData\Local\MicrosoftOutlook, as shown in the picture below –

• Click OK and OST file location will open.
• Select OST file and click Delete, After that, you will get a message of confirmation “Are you sure you want to move this file to recycle bin?” Click Yes and the file gets deleted.

Once OST file is deleted and users need to recreate file to get Outlook to work smoothly. This can be done by creating a new OST file with a different pathname and synchronize it with the Exchange. After that, configure Outlook account and start working with new OST file. Follow the given steps to do this with the given instructions.
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Nathalie Bergh