It’s common for Outlook users to encounter error message ‘Mailbox size limit exceeded’. The message is displayed as a warning notification to inform users that their mailbox size has exceeded the limit.
The error message looks similar to:
NOTE: Even if you don’t receive a warning, your Outlook PST file might become so large that it slows down Outlook’s performance. Also, as PST file exceeds the maximum size limit, the propensity for data corruption exceeds exponentially. If your PST file gets corrupt, use Stellar Repair for Outlook to repair the PST file with precision and speed.
There could be several situations that may increase Outlook mailbox size beyond its permissible limit. Some of them are listed as below:
|Outlook Versions||Outlook Data File Size Limit|
|Outlook 2002 and older version||2GB|
|Outlook 2019 and later versions||50GB|
To resolve the issue, you can choose from any of the following solutions:Solution 1 – Clear-out your mailbox by using Mailbox Cleanup Utility
You can reduce the size of your mailbox by using the Outlook built-in Mailbox Cleanup utility. The utility provides options to de-clutter and organize your Outlook inbox.
Follow these steps to use the cleanup utility:
Step 1: Open the Mailbox Cleanup window:
For Outlook 2007
Click File > Tools > Mailbox Cleanup
Step 2: In the ‘Mailbox Cleanup’ dialog box, choose any one of the following options:
Option 1: Click ‘View Mailbox Size’ to check the size of your mailbox and individual folders within it. This information can help in identifying the folders that about to exceed the mailbox storage quota and needs to be emptied.
Option 2: Filter content by finding items older than a certain date or items larger than a certain size.
Option 3: Click ‘AutoArchive’ to archive items
Option 4: Click ‘Empty’ to delete all the items from the ‘Deleted Items’ folder.
Option 5: Click ‘View Conflicts Size’ to check the size of your Conflicts folder, and then click DeleteLimitations of Mailbox Cleanup Utility
You can increase your inbox size limit in Outlook by making changes to the registry entries in the Registry Editor. To do so, follow these steps:
Step 1: Press ‘Windows’ and ‘R’ keys together to open the Run dialog box
Step 2: In the Run dialog box, type ‘regedit’ and press Enter
Step 3: Click ‘Yes’ when prompted
Step 4: In the ‘Registry Editor’ window, expand the Computer folder in the left pane.
Step 5: Click the ‘HKEY_CURRENT_USER’ folder, and the folder’s contents will get displayed in the right-hand side of the Registry Panel.
Step 6: Navigate to the following registry path:
For Outlook 2007: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\PST
For Outlook 2010: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\PST
For Outlook 2013: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\PST
For Outlook 2016: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\PST
Step 7: Double-click the PST folder, and you’ll find two values in the right pane:
Step 8: Double-click the ‘MaxLargeFileSize’ or ‘WarnLargeFileSize’ value in the list, and enter the Value data (in MB). Choose any one option under the Base tab.
Step 9: Click OK
Step 10: Exit the Registry EditorLimitations of REGEDIT
Use Stellar Toolkit for Outlook software to effectively manage your Outlook mailbox. The software comes bundled with tools that help automate the Outlook mailbox management tasks.
For instance, PST Splitter helps in managing Outlook mailbox by splitting large-sized PST files into smaller PSTs. Also, you can choose to compress a growing Outlook data file by using the PST Compacter tool. In addition, the PST Merger tool helps in cleaning up your mailbox by allowing you to combine multiple PST files into a single file and filtering out duplicate emails.How Stellar Toolkit for Outlook is a better option?
For more information about using the Stellar Toolkit for Outlook, refer to this link.Conclusion
This post outlined the plausible causes resulting in Outlook error message ‘Mailbox size limit exceeded.’ Also, it discussed about the solutions to manage Outlook mailbox size, including the Outlook built-in Mailbox Cleanup utility to get rid of the clutter from your Outlook inbox. In addition, it discussed about modifying the registry entries to reduce the Outlook data file (.ost and .pst) files size. However, both these solutions have certain limitations. By using Stellar Toolkit for Outlook software, you can efficiently manage your mailbox in a fast, reliable and risk-free manner.