There are three steps you can take to try to get Outlook working again. Use the classic Outlook advanced diagnostics troubleshooter to create a detailed configuration report. If you need to increase the number of this limit try the next resolution. Step 1 - The hard limit of recipientsfora single email message is 300. Reduce the number of recipients for a single email to less than 300. If you are unable to connect or are prompted for your password repeatedly attempt the following options.

Classic Outlook calendar checktroubleshooter

If so, wait a short time (usually two or three minutes) to see if Outlook starts working again. You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.

Issue - Pop up with Error Message

• Use the classic Outlook profile setup troubleshooter to set up Microsoft 365 email in classic Outlook.
• Here’s how to disable add-ins in Outlook even when it keeps crashing.
• If you are unable to connect or are prompted for your password repeatedly attempt the following options.
• Get Help has troubleshooters for classic Outlook for Windows you can run for many common scenarios, such as Outlook startup or profile setup problems.
• Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. Message 2 - The file you're attaching is bigger than the server allows. You may see one of the following errors in a pop-up message on your screen. Find solutions to common problems or get help from a support agent. If you are having problems with Outlook, there are a few thingswe can outdoor signs for business help with to get you back to sending and receiving your email.

IV. Rebuild Your Outlook Profile

If Outlook shows Disconnected at the bottom of the status bar, this issue may occur due to improper Autodiscover resolution. Run Test E-mail AutoConfiguration to confirm Autodiscover is resolving to Intermedia servers which helps Outlook to connect properly. Use the classic Outlook connectivity troubleshooter to resolve intermittent connectivity issues. Visit theTechnology Help Desk Support pageto locate your local campus contact information or tosubmit an online technology support request.

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It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running.