Since Snow Leopard, each new release of Mail.app (recently updated with 10.6.5 and now 10.6.7) and the Message.framework it depends on changes a ‘plugin compatibility’ UUID and suddenly breaks any plugins or extensions you have enabled in Mail.app. The developers of each extension have to update each and every one manually, and can’t do so before the new software from Apple is released.

If you can’t (be bothered to) wait for the updates from your plugin developers to arrive, however, and are confident that the plugin will work with the new version, you can hack said plugins and force them to be re-enabled inside Mail.app using the following method. Here I’ll be working with GrowlMail 1.1.2, but this should work for most Mail.app plugins.

A word of warning — not only does this involve editing the plugin’s files, which if you get it wrong could break that plugin and force you to download and install it again, it is possible that your plugin really isn’t compatible with the new version of Mail, in which case it could cause more serious problems. Back stuff up before trying this — you should be doing so anyway.

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Summing my thoughts up and dumping them as quickly as possible:

• Snow Leopard. Why do I always hate Apple’s product names, then warm to them eventually? It’ll have to grow on me. Looks relatively boring. Apple ran out of ideas – lack of innovation.
• iPhone 3G – nice.
• iPhone 2.0 software – looks solid. Nothing earth-shattering that wasn’t really expected. $9.99 + UK VAT + mild extortion will be leaving my bank account soon.
• Mobile Me – reserve judgement. I’d like to give it a try. Not sure I need yet another email address. Probably too expensive.

Any other thoughts? Accepted in brain-dump format or more eloquent versions. 🙂