In this article we will provide you with some troubleshooting steps to resolve issues where Mailbird freezes or becomes stuck (both known as 'hanging').

If Mailbird freezes or becomes stuck, please try taking the following actions:

• Turn off your antivirus or firewall (such as Windows Defender) and see if this improves the situation.
  • Before disabling your antivirus and/or firewall, please exit Mailbird completely.
• If disabling your antivirus or firewall has resolved the problem after you have restarted Mailbird, then we strongly suggest whitelisting Mailbird inside your antivirus or firewall software in order to prevent either one from interfering with Mailbird again.
  • Please refer to this article for more guidance on how to whitelist Mailbird in Windows Defender if you are using Windows 10, or this other article if you are using Windows 11.

Another potential way of resolving this issue, involves deleting Mailbird's Misc folder. Here's how to do this:

• Locate the following folder on your device: C:\Users\(UserName)\AppData\Local\Mailbird
  • (UserName) represents whatever your Windows username is (e.g. John Doe).
• Find a folder at the above location called Misc.
• Next, make a copy of the folder and put it somewhere safe (e.g. on your desktop) and then delete the original Misc folder located in C:\Users(UserName)\AppData\Local\Mailbird\
• After you have deleted it, start Mailbird again and see if this has improved things.

A rare cause for Mailbird becoming stuck could be FormSwift's app - therefore, if you use this particular app, please disable it first and then try restarting Mailbird. If you have noticed an improvement, you will always need to keep FormSwift disabled while running Mailbird since it causes a conflict which we have no control over unfortunately.

If all of the above suggestions do not help, then please create a Support Ticket here so that a member of our team can investigate your problem further. Please remember to include the following information inside of your Support Ticket:

• Your version of Mailbird.
• Whether or not you are seeing a black border around the Compose window (i.e. where you write emails in Mailbird).
• Your Log file.
  • To find your log file, please refer to this other Knowledge Base article which explains how to retrieve it in a few simple steps.

Hopefully one of our suggestions has helped you resolve your problem, but we'll be happy to help if not.