Cleaning the cache in Microsoft Outlook 2013/2016

Whenever Outlook is in the Exchange mode, it will store all emails in its local cache. This cache is used for offline work. If we disable this cache mode, Outlook will have no email without a direct connection with the Exchange server.

Sometimes, Outlook can’t properly display the received emails or can’t find them. A possible reason is a corrupted local e-mail cache. This cache can also be corrupted in a situation when a search cache on the Exchange server is damaged. Continue reading


Windows update error 80248015

A few days ago, I routinely checked my VM for updates. The Windows update dialog opened and it looked like I had never before updated this machine. That is weird. Anyway, I will now check for updates and Windows will be happy. At least, I taught so.

When I clicked on the button [ Check for updates ], Windows update popped up an error message that it cannot search for new updates. The reason was very strange – the service is expired.

Continue reading

Read the Windows platform from the batch file

I need to execute the same batch file on Windows 32 and 64-bit systems. My batch file should somehow automatically read on which platform it’s running and to execute the appropriate part of the file. In addition, it must be usable on any Windows version, starting from Windows 7/2008.

The answer to this problem is to execute the wmic command and filter its output. Now comes the magic. Continue reading

Your DHCP server must be in only one VLAN

Recently, we have made a major upgrade of the network infrastructure for one customer. We replaced the old switches and introduced the complete VLAN infrastructure. At the end of the day, everything seemed to be good.

Then, after two days, DUDE started to raise alarms related to DHCP service. We received a bunch of e-mails related to an empty DHCP pool. It was a mystery how this DHCP pool emptied when there are only 10 workstations and this happened during a public holiday when the offices were empty. Continue reading

Duplicate V3 extension in a X.509 certificate

Recently, I got a report that one application can’t connect to the Exchange server. The error message was:

Exchange server error: The request failed. Duplicate extensions not allowed.

The first Google search revealed to me that this error message is related to the error inside the SSL certificate and the java based library can’t override such situation. Continue reading

Advanced disk repairing option in Windows 8 and later

A few months ago, I encountered a problem with one USB hard disk. Whenever it was attached to any PC, Windows will prompt that volume has errors. As always, we click on Scan and Fix option expecting that that would do the job.

This disk was one of a kind and now you can read about it. I tried a few times to repair it. Every time, the disk check passed and all was fine, until I again needed to reconnect the disk. Then the story repeated. Continue reading