Exchange 2003 Migration to Office 365

Hello, 

I have a question, I might be in a wrong category so if I <g class="gr_ gr_337 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar multiReplace" data-gr-id="337" id="337">am forgive</g> me, so migration from Exchange 2003 Migration to Office 365, the problem is in public folders they are too large, anyone had that problem before? 

So if I'm not in the wrong forum I'll write more detail.

Thanks