不时地不小心删除电子邮件很容易。但是有可能恢复一些被认为永远消失的电子邮件。例如，如果您满足某些条件，可以恢复Office 365中已删除的电子邮件。
如果您尝试在电子邮件被删除的那一刻恢复，则下面描述的方法有更高的工作机会。你等待的时间越长，恢复工作的可能性就越小。
已删除项目文件夹
您应该做的第一件事是检查已删除的电子邮件是否在您的已删除邮件(Deleted Items)文件夹中。登录Office 365后，转到您的邮件(Mail)应用程序。导航到“已删除邮件(Deleted Items)”文件夹并搜索电子邮件。
如果找到，请右键单击电子邮件并使用“移动(Move)”功能选择目标目的地（例如您的收件箱(Inbox)文件夹），以便将其恢复。
如果您要搜索的电子邮件不存在，您可以尝试“恢复已删除邮件(Recover Deleted Items)”选项。右键单击(Right-click)Deleted Items文件夹并选择Recover Deleted Items。
在弹出窗口中，您将看到已永久删除的电子邮件列表。查找目标电子邮件。如果找到，右键单击它并选择Recover。您还可以选择多封电子邮件并一次性恢复它们。
恢复的电子邮件将显示在收件箱(Inbox)文件夹中。
恢复为 Office 365 管理员
Office 365管理员还有另一种恢复丢失电子邮件的选项。他或她可以在Exchange Online中或通过就地(In-Place)电子数据展示和保留(Hold)选项执行此操作。
请(Please)注意，此方法仅在电子邮件尚未从邮箱中完全删除的情况下才有效。它们仍应位于“可恢复项目(Recoverable Items)”文件夹中。
作为管理员，您还可以恢复已删除用户的电子邮件，只要该帐户在停用帐户后的 30 天内。
(Log)以管理员身份登录Office 365 。前往Exchange Admin Portal > Compliance Management > In-Place eDiscovery & Hold。
这将打开Exchange 管理中心(Exchange Admin Center)。单击加号图标(plus icon)将使您能够添加参数以帮助进行电子邮件搜索。您可以按名称搜索、添加关键字、指定电子邮件日期、电子邮件收件人等。
完成后，单击完成(Finish)。这将开始搜索已删除的电子邮件。
一旦Office 365完成该过程，它将显示其结果。通过单击Preview Search Results(Preview Search Results)检查(Check)每个条目并查看它是否包含您要查找的电子邮件。
找到电子邮件后，单击导出按钮并选择目的地。然后将所选项目导出为PST文件。
导出完成后，打开导出的文件以查看内容并恢复丢失的电子邮件。
第三方解决方案
内置的Office 365解决方案是基本的，它们确实有其局限性。您受到时间限制（14 到 30 天之间）的约束。此外，已从“可恢复项目(Items)”文件夹中清除的电子邮件无法再移回“收件箱(Inbox)”文件夹。
这就是为什么一些用户最终使用第三方电子邮件恢复解决方案的原因。如果您最终选择了这条路线，请务必格外小心。从互联网上下载未经证实的程序可能会损害您的计算机。
确保(Make)您只从受信任的来源下载。
How to Recover Deleted Emails in Office 365
It’s easy to
accidentally delete emails every now and then. But it is possible to recover
some emails that are thought to be gone for good. Deleted emails in Office 365,
for exаmple, can be recovered provided you meet cеrtain conditions.
The methods
described below have a higher chance of working if you attempt to recover the
email the moment it’s deleted. The longer you wait, the less likely the
recovery would work.
Deleted Items Folder
The first thing you should do is check if the deleted email is in your Deleted Items folder. While logged into Office 365, go to your Mail app. Navigate your way to the Deleted Items folder and search for the email.
If found, right-click the email and—using the Move function—select a target destination (like your Inbox folder) so it can be restored.
If the email you’re searching for is not there, you can try the Recover Deleted Items option. Right-click the Deleted Items folder and select Recover Deleted Items.
In the pop-up window, you will be shown a list of emails that had been permanently deleted. Look for the target email. If found, right-click on it and select Recover. You can also select multiple emails and recover them all in one go.
Recovered emails
will show up in the Inbox folder.
Recover as Office 365 Administrator
An Office 365 admin has another option for recovering lost emails. He or she can do it in Exchange Online or through the In-Place eDiscovery & Hold option.
Please note that this method will only work if the emails have not been removed completely from the mailbox. They should still be in the Recoverable Items folder.
As an administrator, you can also recover emails from
deleted users so long as it’s still within 30 days since the account had been
deactivated.
Log in to Office 365 as an administrator. Head to the Exchange Admin Portal > Compliance Management > In-Place eDiscovery & Hold.
This will open the Exchange Admin Center. Clicking the plus icon will enable you to add parameters to aid in the email search. You can search by name, add keywords, specify an email date, email recipients, and more.
Once you’re done, click Finish. This will start the search for the deleted email.
Once Office 365 is done with the process, it will display its results. Check each entry and see if it contains the emails you’re looking for by clicking Preview Search Results.
Once you’ve found the emails, click the export button and
select a destination. The selected item will then be exported as a PST file.
Once exporting is finished, open the exported file to view
the content and recover the lost emails.
Third-party solutions
The built-in Office 365 solutions are basic and they do
have their limitations. You’re bound by a time limit (between 14 to 30 days).
Also, emails that had been purged from the Recoverable Items folder can no
longer be moved back to the Inbox folder.
That’s why some users end up using third-party email
recovery solutions. If you do end up going this route, do exercise extreme
caution. Downloading unproven programs off the internet can harm your computer.
Make sure you only download from trusted sources.
