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Skype and iPhone battery life iOS devices
I was on the road for a bit the other day, and when I left home at noon, my iPhone's battery was about 95% full. About 4 hours later, I saw it was down to about 25%, and I wondered what it could have been doing to deplete the battery so much. I thought of the usual culprits, like brightness (it's not at the maximum), Bluetooth (it seems well behaved with iOS 6, going in standby mode when not in use), or push email. Then I looked at which apps were open. I quit them all, including Skype. An hour later, my battery had only dropped another 5%.

When I came home, I did some googling, thinking it could be Skype, or it could be another app. I came across a Skype forum post where someone said they lost 70% in four hours, just like me. There were no other apps running that would have been keeping a connection open, so it's safe to say - given the vast number of people who have commented on the relationship between Skype and poor battery life - that there is a link.

So, if you use Skype, and see bad battery life on your iPhone, try quitting the app and see if this improves things. I haven't done any scientific testing, but there seem to be enough people who have this problem to suggest that Skype may be the culprit.
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Find the email a saved attachment was sent with Apps
If you save an attachment from an e-mail message, and later need to find exactly which message it came from but cannot remember which it was, it can be done with a little bit of work.

First, select the file in the Finder and open its Info window by pressing Command-I. In the More Info section, you should see the file's "Where from" information. This will list the sender's name and address and the subject line of the message that the file was originally attached to. You can first use this information to try searching in Mail for the message. Many times, that's all you'll need to do.

However, if that doesn't cut it for you - for example, you have multiple revisions of a file that were sent back and forth in a series of messages, and you need to determine which came from which - there is one more bit of metadata in the "Where from" information that can solve that for you.

Copy the part of the "Where from" information that looks something like this:
message:%3CCD253A37.36E7E%25sender@example.com%3E
Switch to Safari and paste that into the address field. Mail will activate and show you the message (assuming it still exists).

[kirkmc adds: Nice hint, but it doesn't always work for me. The Where from information is often truncated, and I can't copy the entire path as shown above. However, there's another way to do this: in Terminal, type mdls, press the spacebar, then drag the file to the Terminal window and press Return. This displays all the Spotlight metadata for the file. You'll find the Where from section near the bottom, and you can copy it in its entirety there, then paste it into Safari.

And I'm thinking that someone should be able to create an AppleScript that parses this information with a bit of grep, then sends it to Safari, hence making it possible to create a droplet which will do the trick. Anyone?]
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Reopen accidentally closed tab(s) in Google Chrome Apps
If you close a tab in Google Chrome by accident, there's a keyboard shortcut to reopen it. Just press Command-Shift-T. This works for multiple tabs, though I didn't test to say how many Chrome remembers.
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Clickable links when composing Mail messages Apps
If you have a link in a Mail message that you're composing (this is in rich text mode, after selecting a link, pressing Command-K, then adding the URL), the link will be blue and underlined, but if you click it you won't get taken to the link's page. This is so you can edit the visible text of the link.

However, if you Shift-click on the link, you will be taken to its page. I don't know whether this is new to Mountain Lion, or whether it's been there all along.

[kirkmc adds: I'd never noticed this, but I don't use rich text mode in Mail.]
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Use arrow keys to navigate Stocks widget Desktop
In the Stocks Dashboard Widget, the up- and down-arrow keys will change the selected stock, and the left- and right-arrow keys will toggle through the different time intervals (1d, 1w, 1m, etc.). This may have been possible in earlier versions of OS X but I have only noticed it in Mountain Lion.

[kirkmc adds: Not a game-changing hint, for sure, but if you use the Stocks widget regularly, it can save time.]
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Press the + key on the Phone app number pad iOS devices
Sometimes when calling other countries, I have trouble getting through. For some reason, my phone provider seems to not like numbers with the 00 prefix (the international access code from France), though I never have problems with numbers beginning with + saved in my Contacts.

Rob Griffiths, during a chat the other day, found that if you press and hold the 0 button on the number pad, it types a + character. So to make an international call, all I need to do is press that button, then enter the country code and the number. This will make my international calls a bit easier, at least for people who are not contacts, and who I don't want to make contact cards for.

It's worth noting that pressing any of the other keys, the ones that show letters, such as ABC, only types the number. I guess the fact that the + is on the 0 button makes one think there's a way to get it to display; I had tried in the past, but didn't hold it long enough.
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Set message size limits for OS X Server mail server OS X Server
Apple has published a technical document explaining how to set message size limits for the mail server in OS X Server. By default, messages are limited to 10 MB, but you can change this from the command line using the serveradmin command:
sudo serveradmin settings mail:postfix:message_size_limit = number
See Apple's technical document for more information, and how to specify the number in the command above.
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AppleScript to toggle calendar focus Apps
We recently ran a hint about displaying just one calendar quickly in OS X Calendar. A commenter said, "Anyone know how to show just one calendar and then go back to the group of calendars that were previously checked? That would be awesome."

It turns out that Daniel Jalkut of Red Sweater Software came up with a way to do just that . Using AppleScript and GUI scripting, he found a way to toggle to a single calendar and back to all calendars. Have a look at his blog post and download the script, edit it for your calendar names, and you're in business.
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Easily add photo or video to email message in iOS Mail iOS devices
You can add a photo or a video to an email message in iOS Mail without gong to the Photos app, though it's not very obvious how to do this.

While composing your email:

1. Tap on your email and hold until the "Select, Select All, Paste" menu displays.
2. Tap the arrow button at the right of this menu.
3. Tap Insert Photo or Video.
4. Select the photo or video you want to embed.

[kirkmc adds: I'm sure plenty of you know this, but I certainly didn't. A little curiosity would have found it, but I never tapped on that arrow button.]
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Back up and restore reminders Apps
Apple published a technical note about this yesterday. From Reminders, if you choose File > Export, you can save your reminders to an .ics file; choose File > Import to import a similar file, either following an export or from a backup.

Apple's technical note explains this, and also tells you how you can restore reminders from a Time Machine backup. Since there is no automatic backup of reminders - they do get synced to iCloud, but there's no accessible file anywhere on OS X - this involves finding a file you've backed up and importing it, something you may not be likely to do.

It's in the File menu in the Reminders app on OS X, but I never thought of looking there, so while technically not a hint, it's good to point this out.
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