Can't open Mail

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I received my new MacBook Pro today and began the process of migration from my existing MacBook Pro. Once I'd found a way around transferring the data without any USB-C compatible cables (WiFi), I finally managed to get the transfer done. I then attempted to open Mail only to receive the following message:

Mail Library cannot be read because its format requires a newer version of macOS.

My previous Mac and this new one are both running Catalina, which is the most up to date version, so how do I solve this problem?
 

Cory Cooper

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Hello,

It sounds like the version of Catalina (and thus Mail) are slightly different. Maybe the old MBP had a slightly newer version on it - i.e. old MBP had say 10.13.6 and the new MBP has 10.13.5?

Make sure they are the exact same versions of macOS High Sierra and Mail.

C
 
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You were right Cory about the two Macs running different versions of Catalina. While I was checking this out, I automatically received a message to upgrade the new Mac to 10.13.5 making it the same as the old one. This seemed to unlock the Mail app so all I need to do now is find out what my password was when I first registered with my present internet supplier. I take it that I can't find this from my old Mac as I've looked but the password is not displayed. I've asked the ISP to remind me of my password.
 

Cory Cooper

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Great...glad that was the issue.

Let us know how it goes with the password issue.

C
 

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