So I was deleting some old email attachment files and saved sent email files because I was getting ready to transfer my imac computer contents to a mac mini and needed to make a few MB of room for it to fit. I accidentally left on the "show hidden files" command I ran when doing website design work and I deleted some apparently important file while moving and deleting. What happened after I deleted the file: I was not receiving any emails from my gmail account nor could I send emails. Sending emails would just have it spinning and spinning What I did to try to remedy: (always quitting and reopening Mail app) First I tried disabling all accounts and leaving only one active that I didn't mess with. This resulted in no change, still had the spinning "sending" email. Deleted accounts and recreated the accounts - same issue At this point I was so frustrated and did something without researching it first. I deleted the mail program from the applications folder. All of the library folders are still there, but the program file is not. I read up and read that the Pacifist program could help me install just the Maill app so I downloaded that program, installed the Mail App program, and then tried to open it and I get this error: "can not open Mail App. 4.0 is not compatible with this version of mac OSX" (version of mac OSX is 10.6.5) So then I conceded to completely reinstall the operating system disk. I own the Snow Leopard disk which I purchased as a "family pack" I reinstalled the OS which then showed the Apple Mail icon in the Applications folder and I had a brief moment of glee. I tried to open this new version of Apple Mail and I get the same error!!!! I need to know how to reinstall apple mail for the version of OSX that I have..