I have just attempted to upgrade Plesk from 7.6.1 to 8.1 on one of our servers. The upgrade finished without any problems, so I continued and installed PHP5 support my modifying the existing Plesk installation through Add/Remove programs and I also installed the latest Plesk hotfix (ftp://download1.swsoft.com/Plesk/Autoupdate/plesk_8.1.0_update061226.10.msp), again without any errors. When I tried to log on to Plesk after all this, I had to select the default mail server (this was odd, since the other upgrades I did on other servers didn't asked for this). I picked MailEnable, and it threw this error: If I try to run mchk manually, I get this: I checked the domain_aliases table in the psa database and I got this: I also checked the same table on a server where I upgraded Plesk a few days ago without any problems and I got this: It's obvious that the table structure is different and that on the problematic server the table structure for domain_aliases was not upgraded to 8.1. I managed to get the Plesk Control Panel to work, and I also renamed all the C:\Program Files\SWsoft\Plesk\Mail Servers\Mail Enable\Config\*.sav to C:\Program Files\SWsoft\Plesk\Mail Servers\Mail Enable\Config\*.tab so my clients can login to their email accounts. However, I still can't create or manage domain aliases. Also, I cannot manage any mail settings. When I try to add an alias to an existing mail account: When I try to create a new mail account: So... what can I in this situation? Where do I find the logs for the Plesk upgrade? I'm really stuck here... and I really need URGENT help! I've already sent a ticket to SWsoft about this, but I'm not sure how fast they'll respond to this, especially that it's Friday.