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what do you mean by latest version?
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Latest Exchange version you are running.
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IDFIX wants me to change it because of the invalid character in order to avoid issues during office 365 migration
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IDFIX wants me to change it because of the invalid character in order to avoid issues during office 365 migration

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Do you need additional help? For your query, if you have any custom address, then you might see issue, rest will work fine.
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Do you need additional help? For your query, if you have any custom address, then you might see issue, rest will work fine.

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we are fixing contacts legacy dn that have semicolons would this cause an issue with bounce back since Exchange auto-complete cache uses X.500 addresses for e-mail sent to addresses within the Exchange organization I assume a lot of bounce backs will occur unless I am missing something else.
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we are fixing contacts legacy dn that have semicolons would this cause an issue with bounce back since Exchange auto-complete cache uses X.500 addresses for e-mail sent to addresses within the Exchange organization I assume a lot of bounce backs will occur unless I am missing something else.

IDFix X500 addresses

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.