Outlook PST: Do you know maximum size?


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Is a Google Talk Contact Invisible?

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Is a Google Talk Contact Invisible? Sometimes error messages can reveal more than they were supposed to. Rahul Bansal writes about a simple trick that helps you find out if one of your Google Talk contacts is offline or uses the invisible mode. The trick takes advantage of Google's off the record feature which lets you chat with your contacts without saving the conversations in Gmail. "Chats that have been taken off the record aren't stored in your Gmail chat history, or in the Gmail chat history of your contact. You and the person you're talking to can both see when a chat is taken off the record, and you'll be notified if off the record mode is disabled. Your off the record settings will apply whenever you chat with this person, until one of you makes a change." Let's say you want to know if your co-worker Michael is really offline. If you start a chat when he is online and select "go off the record", none of your messages will be saved in Mi...
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IP addresses to set up fault tolerance?

Why do I need so many IP addresses to set up fault tolerance? There are three 'classes' of IP addresses that we use: 1) 'Front-end' IP addresses - think of these as what are the current IP addresses of each of the Load Balancer machines. Each machine must have a unique IP address to identify itself, so you can contact it directly. '2) Traffic' IP addresses - these are the addresses of your load balancers that the outside world will see and know about. You need at least two of these (so the balancers can have an address each). Unlike the 'front-end' IP addresses, traffic IP addresses are not tied to one machine - they get shared around and moved. For instance, if one of the balancer machines dies, then the other balancer will take its traffic IP address. This way, visitors will always be able to reach your site. '3) Back-end' IP addresses - the balancer machines use these IP addresses to contact the back-end servers. The balancer...
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