众所周知， Microsoft Outlook^{(Microsoft Outlook)}有时会给出错误消息 —无法完成操作。与 Microsoft Exchange 的连接不可用，Outlook 必须在线或连接才能完成此操作^{(The action cannot be completed. The connection to Microsoft Exchange is unavailable, Outlook must be online or connected to complete this action)}。在这篇文章中，我们将展示如何解决此问题并使其恢复正常工作。

与Microsoft Exchange的连接不可用，Outlook必须在线或连接才能完成此操作

有两种方法可以解决 tjis 问题。首先^(First)，创建一个新的默认配置文件。其次^(Second)，删除^(Delete)默认配置文件。没有多少人拥有多个Outlook配置文件并不总是一种选择。所以使用第二种方法如下：

1. 删除默认配置文件
2. 创建新的 Outlook 配置文件
3. ^(Update)使用RPC^(RPC)加密更新或创建Outlook配置文件
4. 禁用所有CAS^(CAS)服务器上的加密要求
5. 部署^(Deploy)组策略^{(Group Policy)}设置以使用RPC加密更新现有Outlook配置文件

第一个，三个可以由最终用户配置，而最后两个仅用于Servers。

1]删除默认配置文件^{(1] Delete Default Profile)}

• 启动Outlook，然后单击Info > Account settings 下拉菜单 > Manage Profile
• 它将打开邮件设置^{(Mail Setup)}窗口。单击^(Click)显示配置文件^{(Show Profiles)}按钮。
• ^(Delete)单击“删除^(Remove)”按钮删除默认配置文件。
• 重新启动 Outlook。

当您删除配置文件时，其帐户的所有离线缓存内容都将被删除。但是，您可以备份 OST 配置文件以重复使用它。

重新启动Outlook时，您必须创建一个新的配置文件，然后再次完成设置过程。

2]创建一个新的Outlook配置文件^{(2] Create a New Outlook Profile)}

如果您不想删除，您可以创建一个新的默认配置文件。在Mail Setup > Profiles部分，您可以单击添加^(Add)按钮，然后为配置文件命名。接下来，您需要添加要添加的电子邮件帐户。确保正确配置电子邮件帐户，以免错误再次出现。此外，请确保将其设置为默认配置文件。

3] 使用 RPC 加密更新或创建您的 Outlook 配置文件^{(3] Update or create your Outlook profile with RPC encryption)}

大多数用户在一个个人资料下拥有所有电子邮件帐户。其中一个电子邮件帐户可能在运行Microsoft Exchange Server 2010、Microsoft Exchange Server 2013或Microsoft Exchange Server 2016时遇到问题。这些通常是未正确配置的公司帐户。

1. 启动Outlook，然后单击Info > Account settings 下拉菜单 > Manage Profile
2. 单击^(Click)E-mail Accounts >Exchange Server配置的电子邮件，然后单击Change >更多设置
3. 在Microsoft Exchange窗口中，切换到安全^(Security)选项卡
4. 选择 在Microsoft Office Outlook和Microsoft Exchange之间^{(Microsoft Exchange)}加密^(Encrypt)数据。 
5. 单击确定并退出

如果是因为RPC加密错误，它应该可以解决问题。

4]禁用所有CAS服务器上的加密要求^{(4] Disable the encryption requirement on all CAS servers)}

这部分专门针对可以禁用加密要求的 IT 管理员。Microsoft 警告说^{(Microsoft warns)}，它只应在您无法立即在 Outlook 客户端上部署必要的RPC加密设置的情况下使用。在Exchange 命令行管理程序^{(Exchange Management Shell)}中运行以下命令：

Set-RpcClientAccess –Server <Exchange server name> –EncryptionRequired:$False

您必须为所有运行Exchange Server 2010^{(Exchange Server 2010)}或更高版本的客户端访问^{(Client Access)}服务器运行此 cmdlet 。为每个具有客户端访问服务器^{(Client Access Server)}角色的Exchange服务器重新运行此命令。此外，请确保禁用我们在上述步骤中讨论的RPC加密。^(RPC)

但是，请确保在部署后重新启用它，并更改Outlook上的^(Outlook)RPC要求。

5]部署组策略设置以使用 RPC 加密更新现有 Outlook 配置文件^{(5] Deploy a Group Policy setting to update existing Outlook profiles with RPC encryption)}

您还可以使用组策略^{(Group Policy)}更改服务器端的RPC设置。导航^(Navigate)到用户配置 > 管理模板 > Microsoft Office “版本号” > Account Settings > Exchange。  找到^(Locate)策略启用 RPC^{(Enable RPC)}加密并将其禁用。

我们希望这些方法可以帮助您解决与Microsoft Exchange相关的^{(Microsoft Exchange)}Outlook问题。

Connection to Microsoft Exchange is unavailable, Outlook must be online

Microsoft Outlook, at times, is known to give аn error saying — The action cannot be completed. The connection to Microsoft Exchange is unavailable, Outlook must be online or connected to complete this action. In this post, we will show how you can fix this problem and get back it to working as usual.

The connection to Microsoft Exchange is unavailable, Outlook must be online or connected to complete this action

There are two ways to fix tjis issue. First, create a new default profile. Second, Delete the default profile. Not many have multiple Outlook profiles is not always an option. So use the second method as follows:

1. Delete Default Profile
2. Create a New Outlook Profile
3. Update or create your Outlook profile with RPC encryption
4. Disable the encryption requirement on all CAS servers
5. Deploy a Group Policy setting to update existing Outlook profiles with RPC encryption

The first, three can be configured by the end-user, while the last two are only for Servers.

1] Delete Default Profile

• Launch Outlook, and then click on Info > Account settings dropdown > Manage Profile
• It will open the Mail Setup window. Click on Show Profiles button.
• Delete the default profile by clicking on the Remove button.
• Restart Outlook.

When you remove the profile, all offline cached content for its account will be removed. However, you can backup the OST profile to reuse it.

When you relaunch Outlook, you will have to create a new profile, and then go through the setup process again.

2] Create a New Outlook Profile

If you do not want to delete, you can create a new default profile. At the Mail Setup > Profiles section, you can click on the Add button, and then give a name to the profile. Next, you need to add the email accounts you want to add. Make sure to properly configure the email account, so the error doesn’t reappear. Also, make sure to set that as the default profile.

3] Update or create your Outlook profile with RPC encryption

Most of the users have all email accounts under one single profile. One of the email accounts may be having trouble with that is running Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, or Microsoft Exchange Server 2016. These are usually corporate accounts that haven’t been configured properly.

1. Launch Outlook, and then click on Info > Account settings dropdown > Manage Profile
2. Click on E-mail Accounts > select the email which is configured with Exchange Server, and then click on Change > More Settings
3. In the Microsoft Exchange window, switch to Security tab
4. Select Encrypt data between Microsoft Office Outlook and Microsoft Exchange. 
5. Click Ok and exit

It should fix the issue if it were because of RPC encryption error.

4] Disable the encryption requirement on all CAS servers

This part is specifically for IT admins who can disable encryption requirements. Microsoft warns that it should be only used where you cannot immediately deploy the necessary RPC encryption settings on your Outlook clients. Run the following command in the Exchange Management Shell:

Set-RpcClientAccess –Server <Exchange server name> –EncryptionRequired:$False

You must run this cmdlet for all Client Access servers that are running Exchange Server 2010 or later version. Rerun this command for each Exchange server that has the Client Access Server role. Also, make sure to disable RPC encryption, which we talked about in the above step.

However, make sure to enable it back again after deployment with changes to the RPC requirement on the Outlook.

5] Deploy a Group Policy setting to update existing Outlook profiles with RPC encryption

You can also change RPC settings on the server-side by using Group Policy. Navigate to User Configuration > Administrative Templates > Microsoft Office “Version number” > Account Settings > Exchange.  Locate policy Enable RPC encryption and disable it.

We hope these methods helped you to resolve Outlook connected issues with Microsoft Exchange.

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