Hi @连国 于,
如果不考虑使用第三方工具进行迁移的话,您可以考虑跨林迁移或者是通过PST文件来进行迁移。
跨林迁移的相关步骤可以参考这个帖子:Cross-forest mailbox migration with ADMT
(此外,还要先enable原Exchange服务器上EWS虚拟目录的MRS proxy)
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