What do I do if my OST file is too big?

Reduce the size of an Outlook Data File (. pst) or Offline Outlook Data File (. ost)

1. Delete any items that you do not want to keep and empty the Deleted Items folder.
2. Click File > Account Settings > Account Settings.
3. On the Data Files tab, click the data file that you want to compact, and then click Settings.

How do I shrink an OST file?

Starting the Compact Now process

1. Open the Data Files tab or dialog. Outlook 2007. File-> Data File Management… Outlook 2010 / 2013 / 2016 / 2019 / Office 365. File-> Account Settings-> Account Settings-> tab: Data Files.
2. Double click on the pst-file or ost-file that you want to shrink.
3. Click the Compact Now button.

What causes OST files to be large?

When you forget to delete unimportant data, it gets piled up, exceeds the file storage limit and causes corruption in OST file and troubles in Outlook. Large-sized attachments also cause oversized OST files.

How do I change the size of my Outlook OST file?

Expand 11.0 for Outlook 2003, 12.0 for Outlook 2007, or 14.0 for Outlook 2010, 15.0 for Outlook 2013, or 16.0 for Outlook 2016, and then expand Outlook. MaxFileSize in the right pane. Click Modify, and then type the value in the Value data box. Click OK.

How do I reduce the size of my Outlook mailbox without deleting it?

5 Ways to Reduce Your Outlook Mailbox Size

1. Mailbox Cleanup. The best place to start is to open the Mailbox Cleanup tool.
2. Move Messages to Your Personal Folders.
3. Archive Older Messages.
4. Empty Deleted Items.
5. Save and Remove Attachments.

How do I make an Outlook email smaller?

Click the message body. On the Message tab, in the Format group, click Zoom. In the Zoom dialog box, under Zoom to, click 100\% for the default size, or use the other options to specify a custom zoom size.

How big can OST file be?

50 GB
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.

How do I reduce my Outlook mailbox size?

In Outlook, choose File > Info > Cleanup Tools > Mailbox Cleanup.

1. First, choose the View Mailbox Size option which scans the size of your mailbox and all of the subfolders.
2. Next, pick the options to Find older or larger items which you can delete directly from the results to cleanup the Outlook mailbox size.

How do I reduce email size in outlook?

Use the Zoom control at the right, bottom of the Outlook window. If you are using a mouse with a wheel control, click the Reading Pane, press Ctrl, and roll the scroll wheel. Rolling the wheel away from you makes the contents larger, rolling the wheel toward you makes the contents smaller.