Running unnecessary add-ins may make Outlook slower and even cause stability issues. You probably have more add-ins installed than you think.
Use the following instructions to see what add-ins you have installed and disable the ones you are not using.
Leave only the Add-ins you absolutely must have in Outlook.
How to disable addins in Outlook 2016, 20 How to disable addins in Outlook 2007 How to disable addins in Outlook 2003 Regularly use Windows Update to keep your computer up to date with the latest patches and service packs.
Note: You can also use scan PST to check and fix your OST files. In addition to PST, OST and profiles, Outlook has several other files which might get corrupted.
Repairing takes hours or days because of the sheer volume of messages that need examining.
Archiving solves a few problems: containing 13 retention tags.
Those tags include: 1 Month Delete 1 Week Delete 1 Year Delete 5 Year Delete 6 Month Delete Default 2 year move to archive Deleted Items Junk Email Never Delete Personal 1 year move to archive Personal 5 year move to archive Personal never move to archive Recoverable Items 14 days move to archive The Default MRM Policy applies to every mailbox unless the administrator decides to create his own policy with a different set of retention tags. The newly created retention tag hasn’t been applied to any user mailboxes yet.
By far the most common reason for Outlook crashes, instability and unexplained weird behavior is a corrupted PST or OST file.
Microsoft is aware of this issue and provides a tool to fix it – Inbox Repair tool (scanpst).
If you need to refer to some messages offline, drag them to a mail folder under On My Computer.