maybe you can try a cutover migration.
Check this out: technet.microsoft.com/.../jj874016(v=exchg.150).aspx
Another option might be exporting and importing .PST files
maybe you can try a cutover migration.
Check this out: technet.microsoft.com/.../jj874016(v=exchg.150).aspx
Another option might be exporting and importing .PST files