Just released the Beta 3 update. The build number is M4_41 but we are calling it "Beta 3 Update" since they're are just a few critical bugs fixed.
- IMAP lockups
- Unable to login on IE
- Some HMTL messages can't be read
In the Network edition there are also updates and fixes in the Outlook Connector. The release notes for both the OS and Network edition are attached.
Please take extra care if you are upgrading directly from M2 or have a multi-node systems. There are a couple extra steps covered in the Release Notes.