Is it safe to mix Omnifocus 3 & 4

I use Omnifocus on 2 computers, only one of which will be able to update to Omnifocus 4. Is it safe to sync data between those machines, or is there something new in Omnifocus 4 that would be removed again by also syncing the database with Omnifocus 3?

It is safe right now, but that will change over time. Omni are usually really good about announcing when that change will be effective from.

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