Manan9 Thank for the answer, but maybe you know , if i reach 100GB archive quota- Exchange Migration stops with error for me that archive storage is full , will auto-expand feature triggers and adds more storage so i can "Resume" migration till i get storage error again or it just stops without ability to Resume migration ? I have required licence. I know auto-expand limitations 1GB/day. If this is not possible i guess it leaves me with 2 options
1. Reduce whole mailbox size including local archive to <170-190GB (100GB for Primary + 100GB Archive).
2. Export PST ~40GB to make whole mailbox below 170-190GB and after migration import PST using Compliance center. This way importing should trigger auto expand feature.