whats the difference between UC optimized and microsoft optimized version?

I have both versions, as far as compatibility with WebEx on USB connection - both the MS and UC versions seem to work identically. They both synchronize the mute button / LED lights on the unit with the mute icon in WebEx. They were also able to be paired to each other (one 710UC and one 710MS) for stereo conferencing / across the room from each other.

does this work with Mac?

Works perfect, bit you hace to select it like you Chanel for sound in and out, in System Preferences, I'm working in Yosemite in laptop and Mavericks in desktop.

Can I connect the 510 to my PC via Bluetooth, or is the bluetooth just for mobile devices and USB is for PC/Mac?

i received the 510 and it connects to my laptop (using built in BT), but it doesnt seem to show anywhere as a usable device. Its not listed in my sound options as a general or communication device or show in my various Softphone related applications. It does show in my devices and printers list as a headset, but that is the only place it shows up.From what i have read it may need the Jabra Link 360 to work as a BT device on a PC? If you were able to set it up on your PC without this device can you provide more details if you had to do anything special?

How long is the cord?

I did not measure, but the cord appears to be approx. 3-4' long. It would definitely be nice if it was longer. It barely reaches from my computer tower to under my monitor (but i have a big desk).My recommendation is to buy a cheap usb entension cable from amazon or ebay.

ASIN	B007SHJIO2
Additional Features	Built In Microphone
Antenna Location	For Smartphones or Tablets
Audio Driver Type	Dynamic Driver
Audio Output Mode	Wideband\|Hifi
Best Sellers Rank	#27,491 in Office Products ( See Top 100 in Office Products ) #12 in Telephone Audio Conferencing Products
Brand	Jabra
Built-In Media	Jabra Speak 410
Color	Black
Compatible Devices	Desktop, Laptop
Connectivity Protocol	USB
Connectivity Technology	Wired
Control Method	Touch
Controller Type	Button
Customer Package Type	Standard Packaging
Customer Reviews	4.6 out of 5 stars 2,770 Reviews
Enclosure Material	Plastic
Frequency Response	20 MHz
Global Trade Identification Number	00615822002523
Is Waterproof	False
Item Dimensions D x W x H	5.27"D x 7.24"W x 2.24"H
Item Weight	6.08 ounces
MP3 player	No
Manufacturer	Jabra
Manufacturer Contact Information	>
Model Name	Speak 410 UC Optimized
Model Number	100-43000000-02
Mounting Type	Tabletop Mount
Number of Audio Channels	2.0
Number of Batteries	1 C batteries required.
Number of Items	1
Power Source	Corded Electric
Series Number	410
Speaker Maximum Output Power	410 Watts
Speaker Size	4 Inches
Speaker Type	Portable
Specific Uses For Product	personal
Total USB 2.0 Ports	1
UPC	100728411758 071020467401 086509077293 615822002523 013269003187 601000864229
Warranty Description	Jabra manufacturer's warranty
Warranty Type	Limited
Wireless Technology	Bluetooth
Woofer Diameter	4.72 Inches

Speak 410 Corded Speakerphone for Softphones – Easy Setup, Portable USB Speaker for Holding Meetings Anywhere with Outstanding Sound Quality

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