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Convenient Techniques to Fix “Exchange Server is Unavailable” Error

Published By Nilesh Kumar
Debasish Pramanik
Approved By Debasish Pramanik
Published On January 25th, 2024
Reading Time 3 Minutes Reading

Just think about a scenario, where you are using Microsoft Office Outlook to manage your daily task. Few days ago, while working in your Outlook profile your Windows system reported an error ”Exchange Server is unavailable”. Do you know any convenient method resolve this error? Here, in this blog, we will discuss convenient techniques to resolve “Exchange Server is Unavailable” error.

Before discussing, how to resolve this error, I would like to discuss causes behind this issue. If user gets fail to connect to their Outlook account through the Exchange Server, system reported some errors like;

1. The connection to Microsoft Exchange is Unavailable
2. Your out of office settings can be displayed as because the server is currently unavailable.
3. Microsoft Outlook not connecting to server.

Causes behind “The connection to the Microsoft Exchange Server is Unavailable” Error are;

1. Improper connectivity in network
2. Incorrect setting in Outlook account
3. Failures of Network resources
4. Incorrect profile configuration in outlook

However, it has been seen that sometimes this error gets fix by restarting the pc. however, some cannot and need a convenient technique to get resolve. Let’s see different fixtures to resolve this error.

Technique 1: Check Whether Office Outlook Files are Locked

Many users prefer to set their Outlook data file in read only mode to fulfill any purpose or by mistake. Make sure that these files are not set to the ‘read-only’ mode. To check this read-only mode of the file, you need to simply watch the location of Outlook data file.

For PST go through – C:Users<username>AppData >Local > MicrosoftOutlook
For OST go through – C:Users<username>AppData >Local > MicrosoftOutlook

Note: This location as mentioned, however slightly differs among different operating system.

Technique 2: Remove if there exist any interference of other applications

There are various applications which conflict with Outlook and produces an error while connecting to the Exchange Server. Sometimes, anti-viruses conflict with Outlook and it generates various types of error. However, such types of error get resolved by opening Outlook in safe mode.

Technique 3: Be Sure Whether MS Outlook Files are Corrupt

It has been noticed that Outlook file gets corrupted after upgrade and results in corruption. You simply need to go through below-mentioned location;
C:Documents and Settings<username>Application DataMicrosoftOutlook
Check about these files – Frmcache.dat, Extend.dat, Views.dat and Outcmd.dat and if they exist you will delete or rename.

Technique 4: Modify the Registry

Modifying registry is not an easy task as improper modification leads to more error and there might chance to crisis. It is always recommended to take backup of original data before implementing this procedure. During the process of modifying registry, you can append the DWORD value to the registry subkey by renaming it as ‘DefConnectOpts.’

Technique 5: Choose Reliable Conversion Solution

It’s a common scenario where Exchange Server turns in dismounting stage or Microsoft Exchange Server is unavailable. In this case, you need to access Exchange OST file in some other file format. Some reliable conversion tool allows you to extract offline outlook data file easily. It will make your OST file accessible in some reliable file format without connection of Exchange Server.


All possible measures to resolve “Exchange Server is unavailable” error are discussed in this blog. Thus, to resolve some other issues such as corrupt data or Outlook failures, users are suggested to first realize the origins of such error.


By Nilesh Kumar

As a Chief Technical Writer, I know the technical issues faced by home and professional users. So, I decided to share all my knowledge via this blog. I love to help you with challenges while dealing with technical jargon.